摘要
为了预测氢氧定容燃烧驱动的高温激波管性能,需要准确分析激波管非定常化学非平衡流动过程。本文在破膜前的驱动段定容燃烧以及破膜后的化学非平衡流动数值模拟中,引入双时间步长方法,发展高温激波管化学非平衡流动数值模拟方法,该方法在时间上具有二阶精度。计算结果与目前存在的激波管流动解析解以及零维化学反应系统的数值解进行了比较,吻合较好。对于典型高温激波管状态,采用有限体积方法离散准一维流动Eu1er控制方程,并通过将流动过程和化学反应动力学过程耦合求解,获得了激波管内部的化学非平衡流动特征。
The unsteady chemical nonequilibrium flowing process will be analyzed precisely so as to predict the performance of the high-temperature shock tube driven by H_2-air combustion at constant volume.The dual-time finite-difference method with the second-order accuracy in time discretization of governing equations is developed and applied to simulate the constant-volume combustion in the driving section and the chemical nonequilibriiim flow processes which appear before and after diaphragm bursting,respectively.The numerical results are compared very well with the analytical solution of shock-tube problem and the existing numerical solutions of zero-dimensional chemical reaction system.The chemical nonequilibrium characteristics at typical thermodynamic states are obtained by solving the quasi-one-dimensional Euler equations with finite-volume approach,and coupling the fluid dynamics and chemical kinetic processes in the simulation of high-temperature shock tube.
出处
《计算力学学报》
CAS
CSCD
北大核心
2013年第S1期124-129,共6页
Chinese Journal of Computational Mechanics
基金
国防基础科研基金(51313030104)
国家自然科学基金(91016027)资助项目
关键词
双时间步长法
高温激波管
零维化学反应
化学非平衡流
pseudo-time finite-difference method
high temperature shock tube
zero-dimensional reaction
chemical nonequilibrium flow
